Fire fighting truck and compressed air foam fire extinguishing system thereof

Abstract

The invention relates to the technical field of fire extinguishing, in particular to a fire fighting truck and a compressed air foam fire extinguishing system thereof. A tooth block is arranged on the side face of each first filter strip, the tooth blocks and the first filter strips are matched to form a tooth plate structure, the width of each tooth block is the same as that of a gap between every two adjacent first filter strips, and when the rotating ring drives the second filter strips to rotate, the shapes between the second filter strips and the first filter strips can be changed; in the process that the rotating ring drives the second filter strip to rotate, the tooth block on the first filter strip can block partial area of the gap between the first filter strip and the second filter strip, so that the gap between the first filter strip and the second filter strip after rotation becomes smaller; furthermore, when a fire fighting truck extracts a water source and small impurities need to be filtered out, a firefighter can control the rotating angle of the rotating ring, so that the gap between the first filter strip and the second filter strip becomes smaller, the effect of filtering the small impurities is achieved, and the using effect of the fire extinguishing spray gun is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fire fighting and extinguishing, in particular to a fire truck and a compressed air foam fire extinguishing system thereof. Background Art

[0002] Fire trucks, also known as fire trucks, are special vehicles used for fire fighting, emergency rescue and other firefighting work. They are equipped with various firefighting equipment and instruments, and can deal with different types of fires and emergencies. They are key equipment for firefighting teams to perform their tasks.

[0003] Fire trucks include dry powder fire trucks, water tank fire trucks and foam fire trucks;

[0004] Among them, the foam fire truck is equipped with a foam liquid tank and a proportional mixing device, which can spray foam to extinguish fires of flammable liquids such as oil; the foam can form a covering layer on the surface of the flammable liquid, isolating the air and achieving the purpose of fire extinguishing;

[0005] In the process of firefighting, the water tank capacity of the fire truck itself varies according to the model, but even for large water tank fire trucks, the water tank capacity is usually about 12 cubic meters. In the face of large-scale fires, such as fires in large buildings and storage areas, this amount of water is far from enough. Therefore, water needs to be pumped from external reservoirs or pools. The pumped water is mixed with foam and then sprayed from the spray gun on the fire truck.

[0006] However, during the storage and transportation process, the foam liquid may be mixed with some impurities, such as dust, rust, fiber, etc. These impurities gradually accumulate at the spray gun nozzle, which can easily cause the spray gun to be blocked;

[0007] In addition, some foam liquids contain some additives or suspended particles. During long-term standing or use, these particles may settle down, especially in the narrow passages of the nozzles, which are more likely to form accumulation and blockage.

[0008] Moreover, when pumping water into the reservoir, impurities in the reservoir can easily enter the nozzle of the spray gun in the fire extinguishing system, which may cause the nozzle of the spray gun to become clogged, reducing the water output and foam volume of the nozzle, and affecting the progress of the fire extinguishing. If the nozzle of the spray gun becomes clogged, firefighters will disassemble it to clean it, which will also affect the progress of the fire extinguishing.

[0009] In summary, in order to solve the technical problems raised in this article, the present invention proposes a fire truck and a compressed air foam fire extinguishing system thereof. Summary of the invention

[0010] The present invention provides a fire truck, which includes a compressed air foam fire extinguishing system arranged above the fire truck, and the fire extinguishing system includes: a foam mixing device and a fire extinguishing device inside the fire truck; the fire extinguishing device includes:

[0011] A fire extinguishing spray gun, which is connected to a mixing device inside the fire truck through a provided water pipe;

[0012] The fire extinguishing spray gun comprises:

[0013] The gun body comprises a water outlet and a water receiving end, the water outlet is provided with an adjusting head; the water receiving end is movably connected with a connecting pipe, the connecting pipe is made of stainless steel, and a threaded groove is provided inside the end of the connecting pipe away from the gun body;

[0014] A plurality of No. 1 filter strips are evenly arranged inside the connecting pipe; and there is a gap between each of the No. 1 filter strips;

[0015] The inner wall of the connecting tube is slidably connected with a rotating ring, the rotating ring is in contact with and slidably connected to the end of the No. 1 filter strip close to the gun body, and the inner ring of the rotating ring is evenly provided with a plurality of No. 2 filter strips, each of which has a gap between them, and the No. 2 filter strips are in contact with the end of the No. 1 filter strip close to the gun body;

[0016] The outer ring of the connecting tube is rotatably connected to a rotating ring, a rotating groove is penetrated through the tube wall of the connecting tube, a slider is arranged on the outer wall of the rotating ring, the slider is located inside the rotating groove, and one end of the slider away from the rotating ring contacts the inner wall of the rotating ring.

[0017] A compressed air foam fire extinguishing system for a fire truck, the fire extinguishing system is applicable to the above-mentioned fire truck, the fire extinguishing system comprises a fire extinguishing device; the fire extinguishing device comprises:

[0018] A fire extinguishing spray gun, which is connected to a mixing device inside the fire truck through a provided water pipe;

[0019] The fire extinguishing spray gun comprises:

[0020] The gun body comprises a water outlet and a water receiving end, the water outlet is provided with an adjusting head; the water receiving end is movably connected with a connecting pipe, the connecting pipe is made of stainless steel, and a threaded groove is provided inside the end of the connecting pipe away from the gun body;

[0021] A plurality of No. 1 filter strips are evenly arranged inside the connecting pipe; and there is a gap between each of the No. 1 filter strips;

[0022] The inner wall of the connecting tube is slidably connected with a rotating ring, the rotating ring is in contact with and slidably connected to the end of the No. 1 filter strip close to the gun body, and the inner ring of the rotating ring is evenly provided with a plurality of No. 2 filter strips, each of which has a gap between them, and the No. 2 filter strips are in contact with the end of the No. 1 filter strip close to the gun body;

[0023] The outer ring of the connecting tube is rotatably connected to a rotating ring, a rotating groove is penetrated through the tube wall of the connecting tube, a slider is arranged on the outer wall of the rotating ring, the slider is located inside the rotating groove, and one end of the slider away from the rotating ring contacts the inner wall of the rotating ring.

[0024] As a preferred solution of the present application, a tooth block is provided on the side of each of the No. 1 filter strips, and the tooth block cooperates with the No. 1 filter strip to form a tooth plate structure, and the width of the tooth block is the same as the gap between adjacent No. 1 filter strips, and a rectangular gap is formed between adjacent tooth blocks on the same No. 1 filter strip and adjacent No. 2 filter strips.

[0025] As a preferred solution of the present application, the gap between adjacent No. 1 filter strips is the same as the gap between adjacent No. 2 filter strips; the number of No. 2 filter strips is one less than that of No. 1 filter strips, and in an initial state, the No. 1 filter strip and the No. 2 filter strip are perpendicular to each other, and when the rotating ring rotates after degrees, the No. 1 filter strip and the No. 2 filter strip are alternately distributed, and the gap between adjacent No. 1 filter strips is blocked by the No. 2 filter strip.

[0026] As a preferred solution of the present application, a rotating column is provided on the No. 2 filter strip located at the center of the rotating ring, and the rotating column passes through the tooth block located at the center of the rotating ring. An installation column is provided at one end of the rotating column away from the No. 2 filter strip, and a cleaning rod is provided on the outside of the installation column.

[0027] As a preferred solution of the present application, the number of the cleaning rods is at least four.

[0028] As a preferred solution of the present application, a cleaning groove is formed through the wall of the connecting pipe, a sealing block is provided on the inner wall of the cleaning groove, and the cleaning groove is located on the side of the No. 1 filter strip away from the gun body.

[0029] As a preferred solution of the present application, the inner wall of the connecting tube is provided with two arc-shaped wire grooves, a spring is arranged inside the wire grooves, the inner wall of the connecting tube is slidably connected to two slides, each of the slides is slidably connected inside the corresponding wire groove, and in an initial state, the two slides are located at the top of the connecting tube, and the sides of the two slides are in contact with each other; each of the slides is connected to both ends of the blocking block by a cable.

[0030] The beneficial effects of the present invention are as follows:

[0031] A tooth block is set on the side of each No. 1 filter strip, and the tooth block cooperates with the No. 1 filter strip to form a tooth plate structure, and the width of the tooth block is the same as the gap between adjacent No. 1 filter strips. When the rotating ring drives the No. 2 filter strip to rotate, the shape between the No. 2 filter strip and the No. 1 filter strip will change, and in the process of the rotating ring driving the No. 2 filter strip to rotate, the tooth block on the No. 1 filter strip will block part of the gap between the No. 1 filter strip and the No. 2 filter strip, so that the gap between the No. 1 filter strip and the No. 2 filter strip after rotation becomes smaller; thereby, when the fire truck is extracting water from the source, if it is necessary to filter out smaller impurities, the firefighter can control the rotation angle of the rotating ring to reduce the gap between the No. 1 filter strip and the No. 2 filter strip, thereby filtering smaller impurities and improving the use effect of the fire extinguishing spray gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a three-dimensional diagram of the gun body of the present invention;

[0033] Figure 2 It is a structural view of the connecting pipe in the present invention;

[0034] Figure 3 It is a structural view of the rotating groove and the slider in the present invention;

[0035] Figure 4 It is a structural view of the wire trough and the slide plate in the present invention;

[0036] Figure 5 It is an exploded view of the No. 1 filter strip and the No. 2 filter strip in the present invention;

[0037] Figure 6 It is a structural view of the No. 2 filter strip and the rotating ring in the present invention;

[0038] Figure 7 This is a structural view of the No. 2 filter strip in the present invention after being rotated 90°;

[0039] Figure 8 This is a structural view of the No. 2 filter strip in the present invention after being rotated 45°;

[0040] In the figure: fire extinguishing spray gun 1, gun body 11, adjusting head 12, connecting pipe 13, threaded groove 131, No. 1 filter strip 132, rotating ring 133, No. 2 filter strip 134, slider 135, gear block 136, rotating column 137, mounting column 138, cleaning rod 139, rotating ring 14, rotating groove 15, cleaning groove 16, blocking block 17, wire groove 18, slide plate 19. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0042] Embodiment 1:

[0043] like Figures 1 to 8 As shown; a fire truck, the fire truck includes a compressed air foam fire extinguishing system arranged above it, the fire extinguishing system includes: a foam mixing device and a fire extinguishing device inside the fire truck; the fire extinguishing device includes:

[0044] A fire extinguishing spray gun 1, wherein the fire extinguishing spray gun 1 is connected to a mixing device inside the fire truck through a provided water pipe;

[0045] The fire extinguishing spray gun 1 comprises:

[0046] The gun body 11 comprises a water outlet and a water receiving end, and the water outlet is provided with an adjusting head 12; the water receiving end is movably connected with a connecting pipe 13, and the connecting pipe 13 is made of stainless steel, and a threaded groove 131 is provided inside the end of the connecting pipe 13 away from the gun body 11;

[0047] A plurality of No. 1 filter strips 132 are evenly arranged inside the connecting tube 13; and there is a gap between each of the No. 1 filter strips 132;

[0048] The inner wall of the connecting tube 13 is slidably connected with a rotating ring 133, and the rotating ring 133 is in contact with and slidably connected to the end of the No. 1 filter strip 132 close to the gun body 11, and the inner circle of the rotating ring 133 is evenly provided with a plurality of No. 2 filter strips 134, each of which has a gap between them, and the No. 2 filter strips 134 are in contact with the end of the No. 1 filter strip 132 close to the gun body 11;

[0049] The outer ring of the connecting tube 13 is rotatably connected to a rotating ring 14. A rotating groove 15 is formed through the wall of the connecting tube 13. A slider 135 is provided on the outer wall of the rotating ring 133. The slider 135 is located inside the rotating groove 15, and one end of the slider 135 away from the rotating ring 133 contacts the inner wall of the rotating ring 14.

[0050] The specific workflow is as follows;

[0051] When in use, the fire extinguishing spray gun 1 is connected to the foam mixing device and the water source inside the fire truck through a water pipe. When connecting the water pipe, the connecting pipe 13 at the water receiving end of the gun body 11 is connected to the water pipe. Specifically, the connecting head on the water pipe is threadedly connected to the connecting groove inside the connecting pipe 13. Then, the spray gun is turned on. The foam inside the fire truck and the connected water source are mixed and enter the gun body 11 through the water pipe. When the water source and foam enter the water pipe, they first pass through the connecting pipe 13, then enter the gun body 11 through the connecting pipe 13, and then pass through the gun body 11 to the regulating head 12 at the water outlet end of the gun body 11, and then are sprayed out through the regulating head 12 (the regulating head 12 is a water column regulating device in the prior art, which will not be described in detail here).

[0052] When foam and water enter the gun body 11 through the connecting pipe 13, the foam and water are first mixed and then pass through the No. 1 filter strip 132 and the No. 2 filter strip 134. When the foam and water pass through the No. 1 filter strip 132 and the No. 2 filter strip 134, firstly, in the initial state, the No. 1 filter strip 132 and the No. 2 filter strip 134 are perpendicular to each other, so that a rectangular hole is formed between the No. 1 filter strip 132 and the No. 2 filter strip 134, so that impurities in the foam and water are filtered and the impurities are blocked on the No. 1 filter strip 132 and the No. 2 filter strip 134;

[0053] During the fire extinguishing process, if the No. 1 filter strip 132 and the No. 2 filter strip 134 are blocked, resulting in a decrease in the water output, the firefighter can hold the rotating ring 14 to rotate the rotating ring 14. When the rotating ring 14 rotates, the rotating ring 14 will drive the slider 135 to rotate. The slider 135 will slide inside the rotating groove 15 provided on the wall of the connecting pipe 13, and when the slider 135 slides at both ends of the rotating groove 15, when the slider 135 slides from one end of the rotating groove 15 to the other end, the rotation angle of the slider 135 is 90°, and when the slider 135 slides inside the rotating groove 15, the slider 135 will drive the rotating ring 133 to rotate on the wall of the connecting pipe 13, and during the rotation of the rotating ring 133, the rotating ring 133 will drive the No. 2 filter strip 134 to rotate, and during the rotation of the No. 2 filter strip 134, the No. 1 filter strip 132 and the No. 2 filter strip 134 The angle between them will change, so that the shape of the gap between the No. 1 filter strip 132 and the No. 2 filter strip 134 will change, so that the impurities stuck between the No. 1 filter strip 132 and the No. 2 filter strip 134 will become loose, and at the same time, the impurities between the No. 1 filter strip 132 and the No. 2 filter strip 134 will be moved. When the firefighter rotates the rotating ring 14 back and forth, the No. 1 filter strip 132 repeatedly rotates on the No. 2 filter strip 134, and the gap between the No. 1 filter strip 132 and the No. 2 filter strip 134 repeatedly changes and vibrates, so that the impurities stuck between the No. 1 filter strip 132 and the No. 2 filter strip 134 are accelerated to separate from the impurities between the No. 1 filter strip 132 and the No. 2 filter strip 134, thereby playing the effect of cleaning the impurities in the gap between the No. 1 filter strip 132 and the No. 2 filter strip 134; and in the cleaning process, there is no need to disassemble the gun body 11 for cleaning, nor is there any need to stop extinguishing the fire source, thereby improving the efficiency of fire extinguishing.

[0054] Embodiment 2:

[0055] like Figures 1 to 8 As shown; a compressed air foam fire extinguishing system for a fire truck, the fire extinguishing system is suitable for the above-mentioned fire truck, the fire extinguishing system includes a fire extinguishing device; the fire extinguishing device includes:

[0056] A fire extinguishing spray gun 1, wherein the fire extinguishing spray gun 1 is connected to a mixing device inside the fire truck through a provided water pipe;

[0057] The fire extinguishing spray gun 1 comprises:

[0058] The gun body 11 comprises a water outlet and a water receiving end, and the water outlet is provided with an adjusting head 12; the water receiving end is movably connected with a connecting pipe 13, and the connecting pipe 13 is made of stainless steel, and a threaded groove 131 is provided inside the end of the connecting pipe 13 away from the gun body 11;

[0059] A plurality of No. 1 filter strips 132 are evenly arranged inside the connecting tube 13; and there is a gap between each of the No. 1 filter strips 132;

[0060] The inner wall of the connecting tube 13 is slidably connected with a rotating ring 133, and the rotating ring 133 is in contact with and slidably connected to the end of the No. 1 filter strip 132 close to the gun body 11, and the inner circle of the rotating ring 133 is evenly provided with a plurality of No. 2 filter strips 134, each of which has a gap between them, and the No. 2 filter strips 134 are in contact with the end of the No. 1 filter strip 132 close to the gun body 11;

[0061] The outer ring of the connecting tube 13 is rotatably connected to a rotating ring 14. A rotating groove 15 is formed through the wall of the connecting tube 13. A slider 135 is provided on the outer wall of the rotating ring 133. The slider 135 is located inside the rotating groove 15, and one end of the slider 135 away from the rotating ring 133 contacts the inner wall of the rotating ring 14.

[0062] A tooth block 136 is provided on the side of each of the No. 1 filter strips 132, and the tooth block 136 cooperates with the No. 1 filter strips 132 to form a tooth plate structure, and the width of the tooth block 136 is the same as the gap between adjacent No. 1 filter strips 132, and a rectangular gap is formed between adjacent tooth blocks 136 and adjacent No. 2 filter strips 134 on the same No. 1 filter strip 132;

[0063] The specific workflow is as follows;

[0064] On the basis of the above-mentioned embodiment 1, a tooth block 136 is provided on the side of each No. 1 filter strip 132, and the tooth block 136 cooperates with the No. 1 filter strip 132 to form a tooth plate structure, and the width of the tooth block 136 is the same as the gap between adjacent No. 1 filter strips 132. When the rotating ring 133 drives the No. 2 filter strip 134 to rotate, the shape between the No. 2 filter strip 134 and the No. 1 filter strip 132 will change, and in the process of the rotating ring 133 driving the No. 2 filter strip 134 to rotate, the shape of the No. 1 filter strip 132 will change. The tooth block 136 will block part of the gap between the No. 1 filter strip 132 and the No. 2 filter strip 134, so that the gap between the No. 1 filter strip 132 and the No. 2 filter strip 134 becomes smaller after rotation; therefore, when the fire truck is extracting water from a source, if smaller impurities need to be filtered out, the firefighter can control the rotation angle of the rotating ring 14 to reduce the gap between the No. 1 filter strip 132 and the No. 2 filter strip 134, thereby filtering out smaller impurities and improving the use effect of the fire extinguishing spray gun 1.

[0065] Embodiment three:

[0066] like Figures 2 to 8 As shown; the gap between the adjacent No. 1 filter strips 132 is the same as the gap between the adjacent No. 2 filter strips 134; the number of the No. 2 filter strips 134 is one less than the No. 1 filter strip 132, and the No. 1 filter strip 132 and the No. 2 filter strip 134 are perpendicular to each other in the initial state. When the rotating ring 133 rotates 90°, the No. 1 filter strip 132 and the No. 2 filter strip 134 are staggered, and the gap between the adjacent No. 1 filter strips 132 is blocked by the No. 2 filter strip 134;

[0067] The specific workflow is as follows;

[0068] On the basis of the above embodiment, the gap between the No. 1 filter strips 132 is the same as the gap between the No. 2 filter strips 134, and the widths of the No. 1 filter strips 132 and the No. 2 filter strips 134 are the same, and the number of the No. 2 filter strips 134 is one less than the No. 1 filter strips 132; for example, in the initial state, the central axis at the center of the rotating ring 133 passes through the middle of the No. 2 filter strip 134 located in the middle, and the central axis at the center of the rotating ring 133 passes through the tooth block 136 between the gaps between the adjacent No. 1 filter strips 132, and does not contact the body of the No. 1 filter strip 132; so that when When the gun body 11 is not in use, the firefighter can rotate the rotating ring 1490° to make the No. 1 filter strip 132 and the No. 2 filter strip 134 parallel to each other. When the No. 1 filter strip 132 and the No. 2 filter strip 134 are parallel to each other, the gaps between adjacent No. 1 filter strips 132 are blocked by the No. 2 filter strip 134, and the gaps between adjacent No. 2 filter strips 134 are blocked by the No. 1 filter strip 132. The No. 1 filter strip 132 and the No. 2 filter strip 134 cooperate to block the connecting pipe 13, so that the connecting pipe 13 cannot meet the water source to pass through, thereby improving the sealing effect when the arc extinguishing spray gun is not in use.

[0069] Embodiment 4:

[0070] like Figures 3 to 8 As shown; a rotating column 137 is provided on the No. 2 filter strip 134 located at the center of the rotating ring 133, and the rotating column 137 passes through the tooth block 136 located at the center of the rotating ring 133. A mounting column 138 is provided at one end of the rotating column 137 away from the No. 2 filter strip 134, and a cleaning rod 139 is provided on the outer side of the mounting column 138;

[0071] The number of the cleaning rods 139 is at least four;

[0072] The specific workflow is as follows;

[0073] A rotating column 137 is arranged on the No. 2 filter strip 134 at the center of the rotating ring 133, and the central axis of the rotating column 137 coincides with the central axis of the rotating ring 133, and the rotating column 137 passes through the tooth block 136 of the No. 1 filter strip 132 located on the central axis of the rotating ring 133, and a mounting column 138 is arranged at the end of the rotating column 137 away from the No. 2 filter strip 134, and a cleaning rod 139 is arranged on the outer side of the mounting column 138, and the cleaning rod 139 contacts the end of the No. 1 filter strip 132 away from the No. 2 filter strip 134; on the basis of the above embodiment, when the firefighter reciprocates the rotating ring 14, the gap between the No. 1 filter strip 132 and the No. 2 filter strip 134 is adjusted. When cleaning the impurities in the filter strip 132, the rotating column 137 rotates synchronously with the No. 2 filter strip 134, and the mounting column 138 on the rotating column 137 rotates with the rotating column 137. The mounting column 138 drives the cleaning rod 139 to rotate. During the rotation of the cleaning rod 139, the end of the No. 1 filter strip 132 away from the No. 2 filter strip 134 is scraped and cleaned; and the number of the cleaning rods 139 is five. Since the rotation angle of the rotating ring 14 is 90°, the number of the cleaning rods 139 is five, so that when the rotating ring 14 rotates, the cleaning rods 139 can completely cover and clean all the No. 1 filter strips 132, thereby improving the cleaning effect of the No. 1 filter strip 132.

[0074] Embodiment five:

[0075] like Figures 1 to 8 As shown; the wall of the connecting pipe 13 is provided with a cleaning groove 16, the inner wall of the cleaning groove 16 is provided with a blocking block 17, and the cleaning groove 16 is located on the side of the first filter strip 132 away from the gun body 11;

[0076] The inner wall of the connecting tube 13 is provided with two arc-shaped wire grooves 18, and a spring is arranged inside the wire grooves 18. The inner wall of the connecting tube 13 is slidably connected with two slide plates 19, and each of the slide plates 19 is slidably connected inside the corresponding wire groove 18. In the initial state, the two slide plates 19 are located at the top of the connecting tube 13, and the sides of the two slide plates 19 are in contact with each other; each of the slide plates 19 is connected to the two ends of the blocking block 17 through cables;

[0077] The specific workflow is as follows;

[0078] A cleaning groove 16 is formed through the wall of the connecting pipe 13, and a blocking block 17 is provided on the inner wall of the cleaning groove 16. The blocking block 17 can be disassembled inside the cleaning groove 16, and the cleaning groove 16 is located on the side of the No. 1 filter strip 132 away from the gun body 11. When performing daily maintenance on the gun body 11 on the fire truck, the firefighter can rotate the rotating ring 14. During the rotation of the rotating ring 14, the cleaning rod 139 cleans the end of the No. 1 filter strip 132 away from the No. 2 filter strip 134. At this time, the firefighter can open the blocking block 17 inside the cleaning groove 16. After the blocking block 17 is opened, as the cleaning plate scrapes the No. 1 filter strip 132, the impurities scraped off the No. 1 filter strip 132 can fall out of the connecting pipe 13 through the cleaning groove 16, thereby improving the cleaning effect of the inside of the connecting pipe 13.

[0079] Two wire grooves 18 are provided on the inner wall of the connecting pipe 13, and a slide plate 19 (the slide plate 19 is made of a light material, such as an aluminum alloy) is slidably connected to the inner wall of the connecting pipe 13 through a spring, and the slide plate 19 is slidably connected to the inner wall of the connecting pipe 13, and the slide plate 19 is connected to the blocking block 17 through a cable. When the blocking block 17 is taken out from the cleaning groove 16, specifically, the firefighter pulls the blocking block 17 out of the cleaning groove 16, the blocking block 17 will pull the cable during the process of pulling the blocking block 17 out of the cleaning groove 16. When the cable is pulled out from the cleaning groove 16, the cable will pull the slide plate 19, and the slide plate 19 slides on the inner wall of the connecting tube 13 toward the cleaning groove 16. During the process, the slide plate 19 pushes the impurities on the inner wall of the connecting tube 13 toward the cleaning groove 16, which improves the discharge effect of the impurities on the wall of the connecting tube 13 from the cleaning groove 16 to a certain extent; when the cleaning is completed, the blocking block 17 is installed on the cleaning groove 16. During the process, the cable and the slide plate 19 gradually become relaxed, and the slide plate 19 is pushed by the spring in the wire groove 18 to reset.

Claims

1. A fire truck, the fire truck comprising a compressed air foam fire extinguishing system arranged on the upper portion thereof, the fire extinguishing system comprising: A foam mixing device and a fire extinguishing device inside a fire truck; characterized in that the fire extinguishing device comprises: A fire extinguishing spray gun (1), wherein the fire extinguishing spray gun (1) is connected to a mixing device inside a fire truck via a provided water pipe; The fire extinguishing spray gun (1) comprises: A gun body (11), the gun body (11) comprising a water outlet end and a water receiving end, the water outlet end being provided with an adjusting head (12); the water receiving end being movably connected with a connecting pipe (13), the connecting pipe (13) being made of stainless steel, and a threaded groove (131) being provided inside an end of the connecting pipe (13) away from the gun body (11); A plurality of No. 1 filter strips (132) are evenly arranged inside the connecting tube (13); and there is a gap between each of the No. 1 filter strips (132); The inner wall of the connecting tube (13) is slidably connected with a rotating ring (133), the rotating ring (133) is in contact with and slidably connected to an end of the No. 1 filter strip (132) close to the gun body (11), and a plurality of No. 2 filter strips (134) are evenly arranged on the inner ring of the rotating ring (133), each of the No. 2 filter strips (134) has a gap between them, and the No. 2 filter strips (134) are in contact with an end of the No. 1 filter strip (132) close to the gun body (11); The outer ring of the connecting tube (13) is rotatably connected to a rotating ring (14); a rotating groove (15) is formed through the wall of the connecting tube (13); a slider (135) is provided on the outer wall of the rotating ring (133); the slider (135) is located inside the rotating groove (15); and one end of the slider (135) away from the rotating ring (133) contacts the inner wall of the rotating ring (14).

2. A compressed air foam fire extinguishing system for a fire truck, which is applicable to a fire truck as claimed in claim 1, characterized in that: The fire extinguishing system comprises a fire extinguishing device; the fire extinguishing device comprises: A fire extinguishing spray gun (1), wherein the fire extinguishing spray gun (1) is connected to a mixing device inside a fire truck via a provided water pipe; The fire extinguishing spray gun (1) comprises: A gun body (11), the gun body (11) comprising a water outlet end and a water receiving end, the water outlet end being provided with an adjusting head (12); the water receiving end being movably connected with a connecting pipe (13), the connecting pipe (13) being made of stainless steel, and a threaded groove (131) being provided inside an end of the connecting pipe (13) away from the gun body (11); A plurality of No. 1 filter strips (132) are evenly arranged inside the connecting tube (13); and there is a gap between each of the No. 1 filter strips (132); The inner wall of the connecting tube (13) is slidably connected with a rotating ring (133), the rotating ring (133) is in contact with and slidably connected to an end of the No. 1 filter strip (132) close to the gun body (11), and a plurality of No. 2 filter strips (134) are evenly arranged on the inner ring of the rotating ring (133), each of the No. 2 filter strips (134) has a gap between them, and the No. 2 filter strips (134) are in contact with an end of the No. 1 filter strip (132) close to the gun body (11); The outer ring of the connecting tube (13) is rotatably connected to a rotating ring (14); a rotating groove (15) is formed through the wall of the connecting tube (13); a slider (135) is provided on the outer wall of the rotating ring (133); the slider (135) is located inside the rotating groove (15); and one end of the slider (135) away from the rotating ring (133) contacts the inner wall of the rotating ring (14).

3. A fire truck compressed air foam fire extinguishing system as claimed in claim 2, characterized in that: A tooth block (136) is provided on the side of each of the No. 1 filter strips (132); the tooth block (136) cooperates with the No. 1 filter strips (132) to form a tooth plate structure; the width of the tooth block (136) is the same as the gap between adjacent No. 1 filter strips (132); and a rectangular gap is formed between adjacent tooth blocks (136) and adjacent No. 2 filter strips (134) on the same No. 1 filter strip (132).

4. A fire truck compressed air foam fire extinguishing system as claimed in claim 3, characterized in that: The gap between adjacent No. 1 filter strips (132) is the same as the gap between adjacent No. 2 filter strips (134); the number of No. 2 filter strips (134) is one less than that of No. 1 filter strips (132); in an initial state, the No. 1 filter strip (132) and the No. 2 filter strip (134) are perpendicular to each other; when the rotating ring (133) rotates 90°, the No. 1 filter strip (132) and the No. 2 filter strip (134) are staggered, and the gap between adjacent No. 1 filter strips (132) is blocked by the No. 2 filter strip (134).

5. A fire truck compressed air foam fire extinguishing system as claimed in claim 2, characterized in that: A rotating column (137) is arranged on the No. 2 filter strip (134) located at the center of the rotating ring (133), and the rotating column (137) passes through the tooth block (136) located at the center of the rotating ring (133). A mounting column (138) is arranged at one end of the rotating column (137) away from the No. 2 filter strip (134), and a cleaning rod (139) is arranged on the outer side of the mounting column (138).

6. A fire truck compressed air foam fire extinguishing system as claimed in claim 5, characterized in that: The number of the cleaning rods (139) is at least four.

7. A fire truck compressed air foam fire extinguishing system as claimed in claim 6, characterized in that: A cleaning groove (16) is formed through the wall of the connecting tube (13), a blocking block (17) is provided on the inner wall of the cleaning groove (16), and the cleaning groove (16) is located on the side of the first filter strip (132) away from the gun body (11).

8. A fire truck compressed air foam fire extinguishing system as claimed in claim 6, characterized in that: The inner wall of the connecting tube (13) is provided with two arc-shaped wire grooves (18), and a spring is arranged inside the wire grooves (18). The inner wall of the connecting tube (13) is slidably connected to two slide plates (19), and each of the slide plates (19) is slidably connected inside a corresponding wire groove (18). In an initial state, the two slide plates (19) are located at the top of the connecting tube (13), and the sides of the two slide plates (19) are in contact with each other; each of the slide plates (19) is connected to the two ends of the blocking block (17) via a cable.

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